/*=========================================================================
 *
 *  Copyright Insight Software Consortium
 *
 *  Licensed under the Apache License, Version 2.0 (the "License");
 *  you may not use this file except in compliance with the License.
 *  You may obtain a copy of the License at
 *
 *         http://www.apache.org/licenses/LICENSE-2.0.txt
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 *
 *=========================================================================*/

#include "itkOtsuThresholdImageFilter.h"

#include "itkImageFileReader.h"
#include "itkImageFileWriter.h"
#include "itkSimpleFilterWatcher.h"
#include "itkTestingMacros.h"

int
itkOtsuThresholdImageFilterTest(int argc, char * argv[])
{
  if (argc < 3)
  {
    std::cerr << "Usage: " << itkNameOfTestExecutableMacro(argv);
    std::cerr << " inputImageFile outputImageFile [numberOfHistogramBins flipOutputIntensities]";
    std::cerr << std::endl;
    return EXIT_FAILURE;
  }

  using InputPixelType = short;
  using OutputPixelType = unsigned char;

  using InputImageType = itk::Image<InputPixelType, 2>;
  using OutputImageType = itk::Image<OutputPixelType, 2>;

  using FilterType = itk::OtsuThresholdImageFilter<InputImageType, OutputImageType>;

  using ReaderType = itk::ImageFileReader<InputImageType>;

  using WriterType = itk::ImageFileWriter<OutputImageType>;

  ReaderType::Pointer reader = ReaderType::New();
  FilterType::Pointer filter = FilterType::New();
  WriterType::Pointer writer = WriterType::New();

  itk::SimpleFilterWatcher watcher(filter);

#if defined(ITKV4_COMPATIBILITY)
  ITK_TEST_EXPECT_TRUE(filter->GetReturnBinMidpoint());
#else
  ITK_TEST_EXPECT_TRUE(!filter->GetReturnBinMidpoint());
#endif

  reader->SetFileName(argv[1]);
  filter->SetInput(reader->GetOutput());
  if (argc > 3)
  {
    filter->SetNumberOfHistogramBins(std::stoi(argv[3]));
  }
  if (argc > 4)
  {
    bool flipOutputIntensities = std::stoi(argv[4]);
    if (flipOutputIntensities)
    {
      // Flip the inside and outside values.
      FilterType::OutputPixelType outsideValue = filter->GetInsideValue();
      FilterType::OutputPixelType insideValue = filter->GetOutsideValue();
      filter->SetInsideValue(insideValue);
      filter->SetOutsideValue(outsideValue);
    }
  }
  if (argc > 5)
  {
    bool returnBinMidpoint = static_cast<bool>(std::stoi(argv[5]));
    ITK_TEST_SET_GET_BOOLEAN(filter, ReturnBinMidpoint, returnBinMidpoint);
  }
  filter->Update();

  // Test GetMacros
  unsigned long numberOfHistogramBins = filter->GetNumberOfHistogramBins();
  std::cout << "filter->GetNumberOfHistogramBins(): " << numberOfHistogramBins << std::endl;
  std::cout << "Computed Threshold is: "
            << itk::NumericTraits<FilterType::InputPixelType>::PrintType(filter->GetThreshold()) << std::endl;
  writer->SetInput(filter->GetOutput());
  writer->SetFileName(argv[2]);
  writer->Update();

  return EXIT_SUCCESS;
}
